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为了探明黄土冲沟地形条件对桥梁桩基础承载力的影响,首次基于自主研发的能充分反映黄土冲沟区域桩基础特点与工作性能的模型试验平台,分析不同冲沟坡度、不同桩长桩基的竖向承载力,桩身轴力及桩侧摩阻力的变化规律,并结合试验结果提出相关的工程技术建议。研究结果表明:1随着坡度的增大,相同桩长的桩基承载力呈降低趋势,承载力影响度逐渐增大,变化范围在7%~35%之间;2在一定范围内,桩基承载力随桩长增加增幅越大,桩长增加到一定程度时,承载力增幅逐渐变缓;3随着坡度增加,相同入土深度下的有效桩长逐渐减小;4黄土冲沟斜坡区域桥梁桩基设计应充分考虑防止桩周土体流失的工程技术。
In order to explore the influence of loess gully topography on the bearing capacity of bridge pile foundation, based on the self-developed model test platform which can fully reflect the characteristics and working performance of pile foundation in loess gully area, The vertical bearing capacity of the foundation, the axial force of the pile and the frictional resistance of the pile. According to the test results, relevant engineering suggestions are put forward. The results show that: 1 With the increase of slope, the bearing capacity of pile with the same pile length tends to decrease, and the influence of bearing capacity increases gradually, ranging from 7% to 35%. 2 In a certain range, When the pile length increases to a certain extent, the increase of bearing capacity gradually becomes slow; 3 With the increase of slope, the effective pile length under the same soil penetration depth decreases gradually; 4, Bridge pile foundation design should give full consideration to prevent the loss of soil around the pile engineering technology.